Stroke sensing device for headrest support rod

Abstract

The utility model belongs to the field of detection, and provides a stroke sensing device for a headrest support rod, a connecting part and a support rod part are formed on the headrest support rod, and the stroke sensing device comprises a support mechanism, a first pressing mechanism and a second pressing mechanism; the induction column movably penetrates through the supporting mechanism in the vertical direction, an induction face is arranged at the top end of the induction column, and the induction column can contract along the interior of the supporting mechanism due to extrusion of the connecting part, so that the induction face and the surface of the reference block are located at the same horizontal height; a lever and a proximity switch. Compared with the prior art, the headrest support rod welding device has the advantages that the displacement generated by the induction column is amplified through the lever, the displacement of the induction column is detected through the proximity switch, it is ensured that the induction face and the reference face are located at the same horizontal height, and a headrest support rod is accurately arranged at the position to be welded; the phenomenon that the headrest supporting rod inclines when placed due to the fact that the supporting mechanism is affected by material slag or waste chips is avoided, and it is ensured that the quality after welding can meet the use requirements needed by customers.

Description

Technical Field

[0001] The utility model belongs to the detection field, and in particular relates to a travel sensing device for a headrest support rod. Background Art

[0002] With the rapid development of the machinery industry, people's requirements for product quality are increasing day by day, and the final welding quality of the product is closely related to the accuracy of its placement during welding.

[0003] like Figure 1 As shown, the existing headrest support rod is composed of a connecting portion and two support rod portions, wherein the connecting portion is used to connect with the headrest. Among the currently existing tooling fixtures, most of them only support and press the connecting portion and the support rod portion to ensure the stability of the headrest support rod during welding. However, with frequent welding operations, the reference block used to support the connecting portion will inevitably have residual slag and waste chips during welding, which also makes it impossible for the subsequent headrest support rod to be welded to be placed in the accurate welding position. This phenomenon is difficult to detect through manual visual observation, which leads to the final welding quality of the headrest support rod failing to meet the customer's usage requirements, seriously affecting the product's qualification rate. Utility Model Content

[0004] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is to provide a travel sensing device for a headrest support rod.

[0005] The utility model solves the technical problem by adopting a technical solution of providing a travel sensing device for a headrest support rod, wherein a connecting portion and a support rod portion are formed on the headrest support rod, and the travel sensing device comprises:

[0006] Workbench;

[0007] A supporting mechanism, arranged on the tooling table, wherein a reference block is provided on the supporting mechanism, and the reference block is used to support the connecting portion to be welded;

[0008] A first clamping mechanism and a second clamping mechanism are both arranged on the tooling table, wherein the first clamping mechanism is located at one side of the supporting mechanism and is used to movably clamp the connecting portion on the reference block to limit the movement of the connecting portion relative to the tooling table; the second clamping mechanism is located between the two support rods to clamp the support rods on the tooling table;

[0009] A sensing column, which moves along the vertical direction and penetrates the supporting mechanism, and a sensing surface is provided on the top of the sensing column. The sensing column can be compressed along the inside of the supporting mechanism due to the compression of the connecting portion, so that the sensing surface and the surface of the reference block are at the same level;

[0010] A lever and a proximity switch are arranged at the bottom of the workbench, the bottom of the sensing column is movably hinged to the lever, one end of the lever is hinged to the supporting mechanism, and the other end is movably overlapped on the proximity switch;

[0011] When the sensing column moves, the displacement generated by the sensing column can be amplified by the lever so that the proximity switch can detect the position of the connecting portion.

[0012] In the above-mentioned travel sensing device for a headrest support rod, the support mechanism includes:

[0013] A fixing seat, arranged on the workbench, wherein a mounting groove is arranged in the fixing seat, and the reference block is detachably connected in the mounting groove;

[0014] A locking block is movably arranged in the fixing seat, a locking groove is formed on the locking block, and the opening direction of the locking groove is inclined to limit the connecting part in the locking groove;

[0015] The locking assembly is arranged on one side of the fixing seat. The locking assembly is provided with a locking block. The locking block is movably inserted between the fixing seat and the locking block to prevent the locking block from rotating relative to the fixing seat.

[0016] In the above-mentioned travel sensing device for a headrest support rod, a U-shaped block is detachably connected to the bottom of the workbench, the proximity switch is vertically arranged in the U-shaped block, and the end of the lever away from the sensing column extends into the U-shaped block and movably presses against the proximity switch.

[0017] In the above-mentioned travel sensing device for a headrest support rod, the support mechanism also includes a first positioning block and a second positioning block which are both movably inserted in the fixed seat, and a limited position cavity is formed between the first positioning block, the second positioning block and the fixed seat, and the locking block is movably arranged in the limited position cavity.

[0018] In the above-mentioned travel sensing device for a headrest support rod, a mutually communicating limit groove is formed between the fixing seat and the locking block, and the locking block is movably inserted in the limit groove to limit the movement of the locking block in the limit cavity.

[0019] In the above-mentioned travel sensing device for a headrest support rod, the locking assembly also includes a driving member and a connecting block, the locking block is connected to the connecting block, and the driving end of the driving member is connected to the connecting block to drive the locking block to move back and forth.

[0020] In the above-mentioned travel sensing device for a headrest support rod, the first pressing mechanism includes:

[0021] A pressing cylinder is arranged on the tooling table, and a convex portion is formed on the pressing cylinder;

[0022] A first clamping block and a connecting plate, wherein one end of the first clamping block is hinged to the driving end of the clamping cylinder, and the other end is movably clamped to the connecting portion; one end of the connecting plate is hinged to the protruding portion, and the other end is hinged to the first clamping block.

[0023] In the above-mentioned travel sensing device for a headrest support rod, an inclined plate is provided on the workbench, a fixed block and a concave plate are provided on the inclined plate, a positioning groove is formed in the fixed block, and two support rod parts on the headrest support rod are respectively placed in the positioning groove and the concave plate.

[0024] In the above-mentioned stroke sensing device for a headrest support rod, the second clamping mechanism includes a rotating cylinder and a second clamping block, the rotating cylinder is arranged on the inclined plate, and the second clamping block is connected to the driving end of the rotating cylinder to drive the second clamping block to movably clamp the support rod part in the positioning groove and the concave plate.

[0025] In the above-mentioned travel sensing device for a headrest support rod, a first rotating block and a second rotating block are further provided on the inclined plate, and a distance between the first rotating block and the second rotating block is smaller than a diameter of the support rod portion.

[0026] Compared with the prior art, the utility model has the following beneficial effects:

[0027] (1) The utility model discloses a travel sensing device for a headrest support rod, which generates an extrusion force on the sensing column when the connecting portion is placed, so that the displacement of the sensing column can be amplified by a lever, and then the displacement of the sensing column is detected by a proximity switch, ensuring that the sensing surface and the reference surface are at the same level, effectively avoiding the support mechanism from being affected by slag or waste, resulting in the tilting of the headrest support rod when it is placed. This method can ensure that the headrest support rod is accurately placed at the position to be welded in real time, ensuring that the quality after welding can meet the use requirements of customers.

[0028] (2) The limiting cavity formed between the first positioning block, the second positioning block and the fixing seat can play a pre-positioning effect when the locking block is placed, and then the locking block penetrates the locking block and the fixing seat, thereby effectively ensuring the stability of the locking groove when locking the connecting part.

[0029] (3) The positioning groove on the fixed block can pre-position the support rod for installation and placement, and cooperate with the locking function of the first rotating block, the second rotating block and the clamping block to ensure the stability of the headrest support rod on the inclined plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 is a stereogram of the present application;

[0031] Figure 2 This is the installation structure view of the fixing base, sensing column, lever and proximity switch;

[0032] Figure 3 It is an exploded view between the fixing seat and the first positioning block and the second positioning block;

[0033] Figure 4 This is the installation structure view of the locking assembly;

[0034] Figure 5 is a view of the installation structure of the first clamping mechanism;

[0035] Figure 6 This is a view of the installation structure of the second clamping mechanism, the fixing block and the concave plate on the inclined plate.

[0036] In the figure, 1, headrest support rod; 10, connecting part; 11, support rod part;

[0037] 2. Workbench; 20. U-shaped block; 21. Inclined plate; 22. Fixed block; 220. Positioning groove; 23. Concave plate; 24. First rotating block; 25. Second rotating block;

[0038] 3. Support mechanism; 30. Reference block; 31. Fixed seat; 310. Mounting groove; 311. Profile groove; 32. Locking block; 320. Locking groove; 33. Locking block; 34. First positioning block; 340. Arc-shaped abutment surface; 35. Second positioning block; 36. Limiting cavity; 37. Limiting groove; 38. Driving member; 39. Connecting block;

[0039] 4. first pressing mechanism; 40. pressing cylinder; 400. raised portion; 41. first pressing block; 42. connecting plate;

[0040] 5. Second pressing mechanism; 50. Rotating cylinder; 51. Second pressing block;

[0041] 6. Sensing column; 60. Sensing surface;

[0042] 7. Leverage;

[0043] 8. Proximity switch. DETAILED DESCRIPTION

[0044] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0045] like Figures 1 to 6As shown, the utility model is a travel sensing device for a headrest support rod 1, on which a connecting portion 10 and a support rod portion 11 are formed, wherein the travel sensing device comprises: a tooling table 2; a supporting mechanism 3, which is arranged on the tooling table 2, and a reference block 30 is arranged on the supporting mechanism 3, and the reference block 30 is used to support the connecting portion 10 to be welded; a first clamping mechanism 4 and a second clamping mechanism 5, both of which are arranged on the tooling table 2, and the first clamping mechanism 4 is located on one side of the supporting mechanism 3, and is used to movably clamp the connecting portion 10 on the reference block 30 to limit the movement of the connecting portion 10 relative to the tooling table 2; the second clamping mechanism 5 is located between the two support rod portions 11, so as to The support rod 11 is pressed tightly on the workbench 2; the sensing column 6 is movable in the vertical direction to penetrate the supporting mechanism 3, and a sensing surface 60 is provided on the top of the sensing column 6. The sensing column 6 can be compressed along the inside of the supporting mechanism 3 due to the squeezing of the connecting portion 10, so that the sensing surface 60 and the surface of the reference block 30 are at the same horizontal height; the lever 7 and the proximity switch 8 are arranged at the bottom of the workbench 2, the bottom of the sensing column 6 is movably hinged to the lever 7, and one end of the lever 7 is hinged to the supporting mechanism 3, and the other end is movably overlapped on the proximity switch 8; when the sensing column 6 moves, the displacement generated by it can be amplified by the lever 7 so that the proximity switch 8 can detect the position of the connecting portion 10.

[0046] In this embodiment, it should be noted that when the headrest support rod 1 has not been placed on the support mechanism 3, the height of the top of the sensing column 6 (equivalent to the sensing surface 60) arranged in the vertical direction is slightly higher than the height of the surface of the reference block 30 (not shown in the figure). In this way, when the connecting portion 10 is placed on the support mechanism 3, it is bound to touch the sensing column 6 in advance, thereby giving the sensing column 6 a pressing force to contract toward the inside of the support mechanism 3. If the support mechanism 3 can always maintain smoothness (i.e., no slag or waste) after frequent welding, the sensing column 6 is most likely to be welded. Finally, it can be moved to a position where the sensing surface 60 and the surface of the reference block 30 are at the same horizontal height. At this time, the connecting part 10 is supported by the sensing column 6 and the reference block 30, ensuring that the quality after welding can meet the customer's use requirements; if there are slag or waste chips left inside the supporting mechanism 3 after frequent welding, the sensing column 6 cannot be compressed to a state where the sensing surface 60 is flush with the surface of the reference block 30, and because the displacement of the sensing column 6 is too small, it is impossible for the worker to directly detect it by vision. Therefore, the present solution has a lever 7 hinged at the bottom of the sensing column 6, such as Figure 2As shown, the distance from the hinge of the lever 7 and the support mechanism 3 to the sensing column 6 is much smaller than the distance from the end of the lever 7 away from the support mechanism 3 to the sensing column 6. For this reason, when the sensing column 6 produces a small displacement, the displacement can be amplified (lever 7 principle) through the far end of the lever 7 (that is, the end of the lever 7 away from the support mechanism 3), and then the extrusion force applied by the far end of the lever 7 to the proximity switch 8 is used to detect the displacement of the sensing column 6 through the proximity switch 8, so as to make corresponding adjustments, thereby effectively avoiding the support mechanism 3 from being affected by slag or waste chips, causing the headrest support rod 1 to tilt when placed. This method ensures that the headrest support rod 1 is in an accurate welding position, ensures that the quality after welding can meet the customer's usage requirements, and thus improves the product qualification rate.

[0047] A U-shaped block 20 is detachably connected to the bottom of the workbench 2 , and the proximity switch 8 is vertically arranged in the U-shaped block 20 . The end of the lever 7 away from the sensing column 6 extends into the U-shaped block 20 and is movably pressed against the proximity switch 8 .

[0048] like Figure 1 and Figure 2 As shown, the U-shaped block 20 can be detachably connected to the bottom of the workbench 2 by screws, screws or other means, which is conducive to the installation and removal of the proximity switch 8 and provides convenience for subsequent maintenance and replacement. It is worth noting that the proximity switch 8 in this solution is arranged in the U-shaped block 20 in the vertical direction, and the end of the lever 7 away from the sensing column 6 is movably pressed against the proximity switch 8, and the displacement of the sensing column 6 is fed back by the change of the pressing force of the end of the lever 7 on the proximity switch 8. Preferably, the model of the proximity switch 8 in this solution can be replaced by other conventional proximity switches 8 such as E2E-X1C1, E2E-X1C2, etc.

[0049] The supporting mechanism 3 includes: a fixed seat 31, which is arranged on the workbench 2, and a mounting groove 310 is provided in the fixed seat 31, and the reference block 30 is detachably connected in the mounting groove 310; a locking block 32, which is movably arranged in the fixed seat 31, and a locking groove 320 is formed on the locking block 32, and the opening direction of the locking groove 320 is inclined to limit the connecting part 10 in the locking groove 320; a locking assembly, which is arranged on one side of the fixed seat 31, and a locking block 33 is provided on the locking assembly, and the locking block 33 is movably inserted between the fixed seat 31 and the locking block 32 to prevent the locking block 32 from rotating relative to the fixed seat 31.

[0050] like Figures 1 to 3As shown, the reference block 30 in the present scheme can also be connected to the installation groove 310 by means of screws, screws or other means to ensure that the reference block 30 can be disassembled and replaced in time when it is damaged; it is worth noting that when the locking block 32 is placed in the fixing seat 31, it is placed in an inclined posture and is not fixed. Only when the connecting part 10 is placed on the reference block 30 and clamped in the locking block 32, the locking assembly can drive the locking block 33 to be inserted into the fixing seat 31 and the locking block 32, ensuring that the locking block 32 maintains a stable posture relative to the fixing seat 31, while the tilted placement of the opening end of the locking groove 320 can be used to further limit the displacement of the connecting part 10, which greatly improves the smoothness and stability during welding.

[0051] The support mechanism 3 further includes a first positioning block 34 and a second positioning block 35 both movably inserted in the fixing seat 31 , and a limited position cavity 36 is formed between the first positioning block 34 , the second positioning block 35 and the fixing seat 31 , and the locking block 32 is movably disposed in the limited position cavity 36 .

[0052] For the installation of the locking block 32, continue to refer to Figure 2 and Figure 3 The fixing seat 31 is provided with a plurality of profiling grooves 311. During the installation process, the first positioning block 34 and the second positioning block 35 can be respectively inserted into the corresponding profiling grooves 311. After the first positioning block 34 and the second positioning block 35 are installed to the specified position, a limited position cavity 36 is formed between the first positioning block 34 and the second positioning block 35 and the fixing seat 31. Figure 2 As shown, the size of the limiting cavity 36 is close to the thickness of the locking block 32, so that the locking block 32 can be placed in the limiting cavity 36 to prevent it from shaking. At the same time, it also provides a guarantee for the stability of the locking block 33 to accurately penetrate the fixing seat 31 and the locking block 32 after the connecting part 10 is engaged with the locking groove 320.

[0053] Preferably, the first positioning block 34 in the present embodiment is provided with an arc-shaped abutment surface 340. During the placement of the locking block 32, the arc-shaped abutment surface 340 can be used to give the locking block 32 a pre-positioning effect, thereby ensuring that the locking block 32 can be accurately located at the desired position and complete the stable locking of the connecting part 10.

[0054] A mutually communicating limiting groove 37 is formed between the fixing seat 31 and the locking block 32 , and the locking block 33 is movably inserted in the limiting groove 37 to limit the movement of the locking block 33 in the limiting cavity 36 .

[0055] When the connecting part 10 on the headrest support rod 1 is accurately placed on the sensing column 6 and the reference block 30 at the same horizontal height, it means that the locking groove 320 on the locking block 32 has achieved preliminary locking and fixing of the connecting part 10. At this time, the locking assembly can drive the locking block 33 to move, and then after the locking block 33 passes through the limiting groove 37 in the fixing seat 31 and the locking block 32 at the same time, the locking block 32 is further limited, ensuring that the headrest support rod 1 can always maintain stability during the subsequent welding process.

[0056] The locking assembly further includes a driving member 38 and a connecting block 39 , the locking block 33 is connected to the connecting block 39 , and a driving end of the driving member 38 is connected to the connecting block 39 to drive the locking block 33 to move back and forth.

[0057] refer to Figure 3 and Figure 4 In order to achieve the reciprocating movement of the locking block 33, the present solution is provided with a driving member 38 on the workbench 2. When the connecting portion 10 is placed on the reference block 30 and is clamped in the locking groove 320 of the locking block 32, the driving member 38 can drive the locking block 33 to move through the connecting block 39. Since the locking block 33 is originally located in the fixing seat 31, with the driving of the driving member 38, the locking block 33 can move in the direction of the locking block 32 and then pass through the limiting groove 37 in the locking block 32 to complete the locking of the locking block 32. Similarly, when the welding process of the headrest support rod 1 is completed and needs to be disassembled, the driving member 38 can drive the locking block 33 out of the locking groove 320 of the locking block 32 again. It is worth noting that the shapes of the limit groove 37 and the locking block 33 in this solution are both non-circular designs, which effectively prevents the locking block 32 from rotating relative to the locking block 33. In addition, the driving member 38 in this solution can adopt other driving devices such as hydraulic drive and cylinder drive.

[0058] The first clamping mechanism 4 includes: a clamping cylinder 40, which is arranged on the workbench 2, and a protrusion 400 is formed on the clamping cylinder 40; a first clamping block 41 and a connecting plate 42, one end of the first clamping block 41 is hinged to the driving end of the clamping cylinder 40, and the other end is movably clamped on the connecting part 10; one end of the connecting plate 42 is hinged to the protrusion 400, and the other end is hinged to the first clamping block 41.

[0059] like Figure 1 and Figure 5 As shown, the connecting part 10 is accurately placed on the sensing column 6 and the reference block 30 at the same level, and the locking block 32 cooperates with the locking block 33 to lock the connecting part 10 in the locking groove 320, and the driving end of the pressing cylinder 40 is moved along the Figure 5When moving in the vertical direction, the first clamping block 41 can rotate and press on the connecting part 10 by relying on the connecting plate 42 hinged at both ends, effectively preventing the connecting part 10 from detaching from the fixing seat 31 during the welding process, and providing a guarantee for the quality of the headrest support rod 1 after welding. It should be added that the structure and working principle of the clamping cylinder 40 are the same as the cylinder principle used in the traditional way, which will not be described in detail here.

[0060] The workbench 2 is provided with an inclined plate 21 , and the inclined plate 21 is provided with a fixing block 22 and a concave plate 23 . A positioning groove 220 is formed in the fixing block 22 , and the two support rod portions 11 on the headrest support rod 1 are respectively placed in the positioning groove 220 and the concave plate 23 .

[0061] Since the connecting portion 10 and the supporting rod portion 11 on the headrest supporting rod 1 are not on the same plane, when the connecting portion 10 is placed at the designated position, the present solution uses the inclined plate 21 to ensure that the supporting rod portion 11 is tightly fixed. Specifically, Figure 1 and Figure 5 As shown, two fixing blocks 22 are provided on the inclined plate 21, and a positioning groove 220 is formed between the two. During the placement of the headrest support rod 1, one of the support rod portions 11 can be just snapped into the positioning groove 220, thereby achieving the effect of pre-positioning the installation. At this time, the other support rod portion 11 can be placed in the concave plate 23 to achieve a fine adjustment of the overall position of the headrest support rod 1. Finally, the support rod portion 11 is pressed against the inclined plate 21 by the second clamping mechanism 5 to avoid vibration or even deviation of the support rod portion 11 due to unstable fixation during welding, thereby preventing the tilting phenomenon caused by the tilting.

[0062] A first rotating block 24 and a second rotating block 25 are further provided on the inclined plate 21 . The distance between the first rotating block 24 and the second rotating block 25 is smaller than the diameter of the supporting rod portion 11 .

[0063] Further reference Figure 5 The first rotating block 24 and the second rotating block 25 are located at the opening at the top of the concave plate 23. When one of the support rods 11 is placed in the concave plate 23, the end of the support rod 11 is movably connected between the first rotating block 24 and the second rotating block 25. Since the distance between the first rotating block 24 and the second rotating block 25 is slightly smaller than the diameter of the support rod 11, the first rotating block 24 and the second rotating block 25 can further limit the position of the support rod 11. It should be noted that the first rotating block 24 and the second rotating block 25 in the present scheme can be rotated relative to the inclined plate 21, and the outside of the rotating block is preferably wrapped with a rubber pad, so that rolling friction is formed between the rotating block and the support rod 11, which effectively avoids the normal use of the support rod 11 due to severe wear during the fixing process.

[0064] The second clamping mechanism 5 includes a rotating cylinder 50 and a second clamping block 51. The rotating cylinder 50 is arranged on the inclined plate 21. The second clamping block 51 is connected to the driving end of the rotating cylinder 50 to drive the second clamping block 51 to movably clamp the support rod part 11 in the positioning groove 220 and the concave plate 23.

[0065] Similarly, after the two support rod portions 11 are accurately placed in the positioning grooves 220 and the concave plate 23 respectively, and the positioning is achieved by the first rotating block 24 and the second rotating block 25, the rotating cylinder 50 can drive the second clamping block 51 to rotate to the top of the two support rod portions 11 to press the support rod portions 11 against the inclined plate 21, ensuring that the entire headrest support rod 1 can maintain stability during the welding process, and also providing a guarantee that the product can meet the customer's usage requirements.

[0066] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0067] In addition, in the present invention, the descriptions of "first", "second", "one", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0068] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0069] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A travel sensing device for a headrest support rod, wherein the headrest support rod is formed with a connecting portion and a support rod portion, characterized in that: The stroke sensing device comprises: Workbench; A supporting mechanism, arranged on the tooling table, wherein a reference block is provided on the supporting mechanism, and the reference block is used to support the connecting portion to be welded; A first clamping mechanism and a second clamping mechanism are both arranged on the tooling table, wherein the first clamping mechanism is located at one side of the supporting mechanism and is used to movably clamp the connecting portion on the reference block to limit the movement of the connecting portion relative to the tooling table; the second clamping mechanism is located between the two support rods to clamp the support rods on the tooling table; A sensing column, which moves along the vertical direction and penetrates the supporting mechanism, and a sensing surface is provided on the top of the sensing column. The sensing column can be compressed along the inside of the supporting mechanism due to the compression of the connecting portion, so that the sensing surface and the surface of the reference block are at the same level; A lever and a proximity switch are arranged at the bottom of the workbench, the bottom of the sensing column is movably hinged to the lever, one end of the lever is hinged to the supporting mechanism, and the other end is movably overlapped on the proximity switch; When the sensing column moves, the displacement generated by the sensing column can be amplified by the lever so that the proximity switch can detect the position of the connecting portion.

2. A travel sensing device for a headrest support rod according to claim 1, characterized in that: The supporting mechanism comprises: A fixing seat, arranged on the workbench, wherein a mounting groove is arranged in the fixing seat, and the reference block is detachably connected in the mounting groove; A locking block is movably arranged in the fixing seat, a locking groove is formed on the locking block, and the opening direction of the locking groove is inclined to limit the connecting part in the locking groove; The locking assembly is arranged on one side of the fixing seat. The locking assembly is provided with a locking block. The locking block is movably inserted between the fixing seat and the locking block to prevent the locking block from rotating relative to the fixing seat.

3. A travel sensing device for a headrest support rod according to claim 1, characterized in that: A U-shaped block is detachably connected to the bottom of the workbench, the proximity switch is vertically arranged in the U-shaped block, and the end of the lever away from the sensing column extends into the U-shaped block and movably presses against the proximity switch.

4. A travel sensing device for a headrest support rod according to claim 2, characterized in that: The support mechanism further includes a first positioning block and a second positioning block both movably inserted in the fixing seat, and a limited position cavity is formed between the first positioning block, the second positioning block and the fixing seat, and the locking block is movably arranged in the limited position cavity.

5. A travel sensing device for a headrest support rod according to claim 4, characterized in that: A mutually communicating limiting groove is formed between the fixing seat and the locking block, and the locking block is movably inserted in the limiting groove to limit the movement of the locking block in the limiting cavity.

6. A travel sensing device for a headrest support rod according to claim 2, characterized in that: The locking assembly further comprises a driving member and a connecting block, the locking block is connected to the connecting block, and a driving end of the driving member is connected to the connecting block to drive the locking block to move back and forth.

7. A travel sensing device for a headrest support rod according to claim 1, characterized in that: The first pressing mechanism comprises: A pressing cylinder is arranged on the tooling table, and a convex portion is formed on the pressing cylinder; A first clamping block and a connecting plate, wherein one end of the first clamping block is hinged to the driving end of the clamping cylinder, and the other end is movably clamped to the connecting portion; one end of the connecting plate is hinged to the protruding portion, and the other end is hinged to the first clamping block.

8. A travel sensing device for a headrest support rod according to claim 2, characterized in that: The workbench is provided with an inclined plate, the inclined plate is provided with a fixing block and a concave plate, a positioning groove is formed in the fixing block, and two support rod parts on the headrest support rod are respectively placed in the positioning groove and the concave plate.

9. A travel sensing device for a headrest support rod according to claim 8, characterized in that: The second clamping mechanism includes a rotating cylinder and a second clamping block. The rotating cylinder is arranged on the inclined plate. The second clamping block is connected to the driving end of the rotating cylinder to drive the second clamping block to movably clamp the support rod part in the positioning groove and the concave plate.

10. A travel sensing device for a headrest support rod according to claim 8, characterized in that: The inclined plate is further provided with a first rotating block and a second rotating block, and the distance between the first rotating block and the second rotating block is smaller than the diameter of the support rod portion.

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